Nagios Support Forum

Posted: **Tue Mar 04, 2014 10:27 am**

I have centos 32 bit. 3 servers. On server a I have nagios core 4.03 installed. and NRPE v2.12. on server B, C I have installed NRPE v2.12 plugin.

when I run

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 /usr/local/nagios/libexec/check_nrpe -H (Server B/C)
NRPE v2.12

It runs fine, however when I try to execute a command using nrpe it works on server B but not on server C I get the error

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NRPE: Unable to read output

server C log file

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Mar  4 09:23:08 tanaga xinetd[6246]: START: nrpe pid=6403 from=::ffff:172.16.0.18
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200
Mar  4 09:23:08 tanaga nrpe[6403]: Added command[check_new_devices]=/usr/local/nagios/libexec/check_new_devices -t 600
Mar  4 09:23:08 tanaga nrpe[6403]: Handling the connection...
Mar  4 09:23:08 tanaga nrpe[6403]: Host is asking for command 'check_new_devices' to be run...
Mar  4 09:23:08 tanaga nrpe[6403]: Running command: /usr/local/nagios/libexec/check_new_devices -t 600
Mar  4 09:23:08 tanaga nrpe[6403]: Command completed with return code 3 and output: 
Mar  4 09:23:08 tanaga nrpe[6403]: Sending response - bytes left: 27
Mar  4 09:23:08 tanaga nrpe[6403]: Return Code: 3, Output: NRPE: Unable to read output
Mar  4 09:23:08 tanaga xinetd[6246]: EXIT: nrpe status=0 pid=6403 duration=0(sec)

server a log file

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Mar  4 15:24:58 aurora xinetd[4094]: START: nrpe pid=4097 from=::ffff:172.16.0.18
Mar  4 15:25:37 aurora dhcpd: DHCPINFORM from 172.16.0.85 via eth0
Mar  4 15:25:37 aurora dhcpd: DHCPACK to 172.16.0.85 (78:2b:cb:9f:2f:b0) via eth0
Mar  4 15:25:43 aurora dhcpd: DHCPINFORM from 172.16.0.174 via eth0
Mar  4 15:25:43 aurora dhcpd: DHCPACK to 172.16.0.174 (d4:be:d9:18:6a:0a) via eth0
Mar  4 15:25:45 aurora xinetd[4094]: START: nrpe pid=18833 from=::ffff:172.16.0.18
Mar  4 15:26:01 aurora xinetd[4094]: EXIT: nrpe status=0 pid=4097 duration=63(sec)
Mar  4 15:26:35 aurora dhcpd: DHCPINFORM from 172.16.0.147 via eth0
Mar  4 15:26:35 aurora dhcpd: DHCPACK to 172.16.0.147 (18:03:73:2e:f3:fa) via eth0
Mar  4 15:26:45 aurora dhcpd: DHCPINFORM from 172.16.0.174 via eth0
Mar  4 15:26:45 aurora dhcpd: DHCPACK to 172.16.0.174 (d4:be:d9:18:6a:0a) via eth0
Mar  4 15:26:48 aurora xinetd[4094]: EXIT: nrpe status=0 pid=18833 duration=63(sec)
Mar  4 15:27:00 aurora dhcpd: DHCPINFORM from 172.16.0.181 via eth0
Mar  4 15:27:00 aurora dhcpd: DHCPACK to 172.16.0.181 (24:b6:fd:fa:a9:44) via eth0
Mar  4 15:27:12 aurora xinetd[4094]: START: nrpe pid=6159 from=::ffff:172.16.0.18

it runs fine

Posted: **Tue Mar 04, 2014 5:14 pm**

Can you post your /usr/local/nagios/etc/nrpe.cfg files from both servers B and C? And let's see the actual command you try to run that fails.

Also we will want to see the log for Server B in addition to the A and C you posted.

Posted: **Wed Mar 05, 2014 5:15 am**

issue resolved. I was missing php-mysql, my command required it.

Posted: **Wed Mar 05, 2014 10:40 am**

Good to hear. I'll be locking this up now but feel free to start another thread if you have issues in the future.

Posted: **Tue Jul 22, 2014 3:21 am**

Hello,

i have the same problem but still didn't solve this case even when i added the php-mysql.

$ usr/lib/nagios/plugins/check_nrpe -H server43012x -c check_load
NRPE: Unable to read output

# php -m | grep mysql
PHP Warning: Module 'gd' already loaded in Unknown on line 0
mysql
mysqli

Could you please give the best solution for this ?

Thanks.

Posted: **Tue Jul 22, 2014 10:31 am**

I'm going to lock this as you opened your own thread here:

http://support.nagios.com/forum/viewtop ... 350#106365

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